CN203722496U - Circuit for eliminating active clamp topological forward shutdown oscillation - Google Patents
Circuit for eliminating active clamp topological forward shutdown oscillation Download PDFInfo
- Publication number
- CN203722496U CN203722496U CN201320848832.XU CN201320848832U CN203722496U CN 203722496 U CN203722496 U CN 203722496U CN 201320848832 U CN201320848832 U CN 201320848832U CN 203722496 U CN203722496 U CN 203722496U
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- Prior art keywords
- switching tube
- shutdown
- voltage end
- resistance
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 230000010355 oscillation Effects 0.000 title abstract description 11
- 230000035939 shock Effects 0.000 claims description 17
- 230000008030 elimination Effects 0.000 claims description 16
- 238000003379 elimination reaction Methods 0.000 claims description 16
- 239000004065 semiconductor Substances 0.000 claims description 10
- 102100024452 DNA-directed RNA polymerase III subunit RPC1 Human genes 0.000 claims description 4
- 101000689002 Homo sapiens DNA-directed RNA polymerase III subunit RPC1 Proteins 0.000 claims description 4
- 101001100327 Homo sapiens RNA-binding protein 45 Proteins 0.000 abstract description 18
- 102100038823 RNA-binding protein 45 Human genes 0.000 abstract description 18
- 101150090033 DRB2 gene Proteins 0.000 abstract description 15
- 101100117568 Oryza sativa subsp. japonica DRB5 gene Proteins 0.000 abstract description 15
- 230000007423 decrease Effects 0.000 abstract description 7
- 230000001360 synchronised effect Effects 0.000 abstract description 6
- 239000003990 capacitor Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003121 nonmonotonic effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model provides a circuit for eliminating active clamp topological forward shutdown oscillation. The circuit comprises first and second drive voltage ends of a primary side main tube. The circuit further comprises a control circuit connected with the first drive voltage end and used for controlling the on-off state of the first drive voltage end (DRB1), and a charge circuit arranged between the control circuit and the second drive voltage end and used for charging the second drive voltage end (DRB2) when the first drive voltage end (DRB1) is turned off. The circuit provides a low impedance loop and charges a drive of a clamper tube rapidly so as to turn off the clamper tube rapidly and cut off a primary side oscillation loop, thereby enabling a primary side main power transformer to be free of alternatively positive and negative voltages, preventing a secondary side self-driven synchronous rectifying valve from interruptive turning-on situations during the shutdown, making a shutdown output waveform to decrease monotonically, and thus ensuring the system reliability.
Description
Technical field
The utility model relates to the communications field, particularly a kind of elimination active clamp topology normal shock shutdown oscillating circuit.
Background technology
In prior art, the Switching Power Supply of active clamp topology forward converter (as shown in Figure 1), when power input shuts down, after main power tube VT1 drives and closes at once, the negative pressure driving because of clamper tube VT2, without bleed-off circuit, causes the following period of time of clamper tube VT2 after supervisor VT1 closes to maintain and opens a period of time; But during this period, power input transformer T1, clamp capacitor C3, input end capacitor C1, C2 can form oscillation circuit, oscillation circuit can produce oscillating voltage on main power transformer T1, and the driving voltage because of the secondary synchronous rectifier of active clamp topology forward converter is self-powered again, and the voltage producing on power transformer can cause synchronous rectifier separated logical a period of time in shutdown process, for secondary output voltage waveforms, show as output vibration and decline, non-monotonic decline.
Utility model content
The purpose of this utility model is to provide the topological normal shock shutdown of a kind of elimination active clamp oscillating circuit, and while making this active clamp topology forward converter shutdown, output voltage keeps dullness to decline, thereby has guaranteed the reliability of system.
In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of elimination active clamp topology normal shock shutdown oscillating circuit, comprise the first driving voltage end of former limit supervisor and the second driving voltage end of former limit clamper tube, wherein, above-mentioned elimination active clamp topology normal shock shutdown oscillating circuit, also comprises:
Be connected with described the first driving voltage end, for controlling the control circuit of the on off state of described the first driving voltage end DRB1;
Be arranged between described control circuit and described the second driving voltage end, for when described the first driving voltage end DRB1 turn-offs, the charging circuit to described the second driving voltage end DRB2 charging.
Wherein, described control circuit comprises:
One diode VD16, the first switching tube VT8, a resistance-capacitance circuit, divider resistance R49 and divider resistance R51, wherein, described the first driving voltage end DRB1 connects described diode VD16 and is connected with the grid of described the first switching tube VT8;
The grid of described the first switching tube VT8 is also connected with one end of described resistance-capacitance circuit, and the other end of described resistance-capacitance circuit is connected and ground connection with the source electrode of described the first switching tube VT8;
The drain electrode of described the first switching tube VT8 is connected with the mid point of divider resistance R49 and divider resistance R51, another termination accessory power supply VCC of described divider resistance R49, the other end ground connection of described divider resistance R51.
Further, described resistance-capacitance circuit comprises resistance R 48 and the capacitor C 160 being connected in parallel.
Wherein, described charging circuit comprises:
Second switch pipe VT30, resistance R 58, one capacitor C 161, one parallel combinations and a 3rd switching tube VT14, wherein, the grid of described second switch pipe VT30 connects the drain electrode of described the first switching tube VT8, the source ground of described second switch pipe VT30;
The drain electrode of described second switch pipe VT30 is connected with accessory power supply VCC by described resistance R 58 on the one hand, by described capacitor C 161, is connected with one end of described parallel combination on the other hand, and the other end ground connection of described parallel combination;
The drain electrode of described second switch pipe VT30 is also connected with the grid of described the 3rd switching tube VT14 by described capacitor C 161, the source ground of described the 3rd switching tube VT14, and the drain electrode of described the 3rd switching tube VT14 connects described the second driving voltage end DRB2.
Further, described parallel combination is diode VD30 and the resistance R 56 being connected in parallel, and the minus earth of described diode VD30.
Preferably, described the first switching tube VT8, described second switch pipe VT30 and described the 3rd switching tube VT14 are metal-oxide-semiconductor or triode.
Technique scheme of the present utility model at least has following beneficial effect:
In the elimination active clamp topology normal shock shutdown oscillating circuit of the utility model embodiment, one low-impedance path is provided, the driving of clamper tube (negative level) is charged rapidly, thereby turn-off fast clamper tube, cut off former limit oscillation circuit, make the main power transformer in former limit there will not be the positive and negative voltage replacing, thereby make the synchronous rectifier of secondary self-powered when shutdown, not occur separated understanding and considerate condition, allow shutdown output waveform dullness decline, guaranteed the reliability of system.
Accompanying drawing explanation
Fig. 1 represents the main power circuit schematic diagram of active clamp topology forward converter in prior art;
Fig. 2 represents the basic principle figure of the utility model embodiment;
Fig. 3 represents concrete apparatus structure schematic diagram 1 in the utility model embodiment;
Fig. 4 represents concrete apparatus structure schematic diagram 2 in the utility model embodiment;
Fig. 5 represents the shutdown output waveform figure of active clamp topology forward converter in prior art;
Fig. 6 represents the shutdown output waveform figure of elimination active clamp topology normal shock shutdown oscillating circuit of the present utility model.
Embodiment
For making the technical problems to be solved in the utility model, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
For active clamp circuit when shutdown non-monotonic decline of output voltage (as shown in Figure 5) in prior art and while cutting off former limit oscillation circuit, there is the problem of certain risk in the utility model, a kind of elimination active clamp topology normal shock shutdown oscillating circuit is provided, one low-impedance path is provided, the driving of clamper tube (negative level) is charged rapidly, thereby turn-off fast clamper tube, cut off former limit oscillation circuit, make the main power transformer in former limit there will not be the positive and negative voltage replacing, thereby make the synchronous rectifier of secondary self-powered when shutdown, not occur separated understanding and considerate condition, allow shutdown output waveform dullness decline, guaranteed the reliability of system.
As shown in Figure 2, the utility model provides a kind of elimination active clamp topology normal shock shutdown oscillating circuit, comprises the first driving voltage end of former limit supervisor and the second driving voltage end of former limit clamper tube, wherein, above-mentioned elimination active clamp topology normal shock shutdown oscillating circuit, also comprises:
Be connected with described the first driving voltage end, for controlling the control circuit of the on off state of described the first driving voltage end DRB1;
Be arranged between described control circuit and described the second driving voltage end, for when described the first driving voltage end DRB1 turn-offs, the charging circuit to described the second driving voltage end DRB2 charging.
In the utility model above-described embodiment, DRB1 is former limit supervisor's driving voltage, and DRB2 is the driving voltage of former limit clamper tube, and VCC connects accessory power supply; When normal work, the metal-oxide-semiconductor being connected by diode with DRB1 can be in opening state, thereby indirectly guarantees that the metal-oxide-semiconductor being connected with DRB2, in off state, does not affect normal work.Once power circuit shutdown, DRB1 becomes low level, by foregoing circuit, will indirectly make the metal-oxide-semiconductor that is connected with DRB2 open-minded, after this metal-oxide-semiconductor is opened, DRB2 is in a low-impedance path, ground end can charge to DRB2 fast by Low ESR, make its by negative voltage fast to Zero voltage transition, thereby guarantee that clamper tube turn-offs fast, cut off the oscillation circuit on former limit, avoided energy conduction secondary, cause secondary synchronous rectifier separated be open to the custom disconnected, thereby guaranteed the reliability of system, as shown in Figure 6.And the utility model circuit is simple, debugging is convenient, and cost is lower.
Further, as shown in Figure 3, in specific embodiment of the utility model, control circuit and charging circuit can be set to respectively a device, be the driving voltage DRB1 of the main power MOS pipe in the former limit of active clamp as the input voltage of control circuit device, control circuit device is controlled charging circuit device, finally exports former limit clamp voltage DRB2, make power supply shutdown instantaneous trip clamper tube, to eliminate the oscillation circuit on former limit; As shown in Figure 4, in specific embodiment of the utility model, control circuit and charging circuit can be arranged in a device, utilize the driving voltage DRB1 of the main power MOS pipe in the former limit of active clamp to control the shutoff of clamper tube, eliminate the oscillation circuit on former limit, while making to shut down, output voltage is dull declines, and as shown in Figure 6, thereby has guaranteed the reliability of system.
In above-described embodiment of the present utility model, as shown in Figure 2, described control circuit comprises:
One diode VD16, the first switching tube VT8, a resistance-capacitance circuit, divider resistance R49 and divider resistance R51, wherein, described the first driving voltage end DRB1 connects described diode VD16 and is connected with the grid of described the first switching tube VT8;
The grid of described the first switching tube VT8 is also connected with one end of described resistance-capacitance circuit, and the other end of described resistance-capacitance circuit is connected and ground connection with the source electrode of described the first switching tube VT8;
The drain electrode of described the first switching tube VT8 is connected with the mid point of divider resistance R49 and divider resistance R51, another termination accessory power supply VCC of described divider resistance R49, the other end ground connection of described divider resistance R51.
Wherein, described resistance-capacitance circuit comprises resistance R 48 and the capacitor C 160 being connected in parallel.
As shown in Figure 2, in the utility model above-described embodiment, described charging circuit comprises:
Second switch pipe VT30, resistance R 58, one capacitor C 161, one parallel combinations and a 3rd switching tube VT14, wherein, the grid of described second switch pipe VT30 connects the drain electrode of described the first switching tube VT8, the source ground of described second switch pipe VT30;
The drain electrode of described second switch pipe VT30 is connected with accessory power supply VCC by described resistance R 58 on the one hand, by described capacitor C 161, is connected with one end of described parallel combination on the other hand, and the other end ground connection of described parallel combination;
The drain electrode of described second switch pipe VT30 is also connected with the grid of described the 3rd switching tube VT14 by described capacitor C 161, the source ground of described the 3rd switching tube VT14, and the drain electrode of described the 3rd switching tube VT14 connects described the second driving voltage end DRB2.
Wherein, described parallel combination is diode VD30 and the resistance R 56 being connected in parallel, and the minus earth of described diode VD30.
In the utility model specific embodiment, VT8 is NMOS pipe, and VT14 is PMOS pipe, and VT30 is NMOS pipe.And NMOS pipe is gate source voltage conducting when being positive, the conducting when gate source voltage is negative of PMOS pipe,
In the utility model embodiment, when Switching Power Supply is normally worked, DRB1 is continuous pulse signal, when being high level, DRB1, by VD16, the grid capacitance of VT8 and C160 are carried out to quick charge, make grid voltage moment become high potential, when DRB1 is low level, because R48 resistance is larger, the grid capacitance electric discharge of C160 and VT8 slowly, at DRB1, be between low period, to drop to the threshold voltage of VT8, therefore in whole normal work period, VT8 is always in conducting state, make the grid of VT30 always in low spot position, VT30 cut-off, the drain electrode of VT30 is high, the anode of diode VD30 should be height, but the clamping action due to diode, make it in 0.7V left and right, metal-oxide-semiconductor VT14 cut-off, thereby do not affect DRB2.
Switching Power Supply is shut down moment, DRB1 is low level, grid capacitance and the C160 of VT8 discharge by R48, when grid voltage is when opening threshold voltage, VT8 turn-offs, the grid of VT30 is high, VT30 conducting, and the drain electrode of VT30 is low, the characteristic that can not suddenly change according to electric capacity both end voltage, the anode voltage of diode VD30 becomes negative pressure, VT14 conducting, now, VT14, DRB2, form low-impedance path, DRB2 is charged, make the negative pressure of DRB2 return to rapidly zero level, clamper tube moment turn-offs, thereby has guaranteed the reliability of circuit.
In the utility model above-described embodiment, described the first switching tube (VT8), described second switch pipe (VT30) and described the 3rd switching tube (VT14) are metal-oxide-semiconductor or triode.
In the utility model embodiment, metal-oxide-semiconductor can also be NMOS pipe or PMOS pipe, can be according to equipment purposes, and power, the combined factors such as cost determine to use metal-oxide-semiconductor or triode.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (6)
1. eliminate an active clamp topology normal shock shutdown oscillating circuit, comprise the first driving voltage end of former limit supervisor and the second driving voltage end of former limit clamper tube, it is characterized in that, above-mentioned elimination active clamp topology normal shock shutdown oscillating circuit, also comprises:
Be connected with described the first driving voltage end, for controlling the control circuit of the on off state of described the first driving voltage end (DRB1);
Be arranged between described control circuit and described the second driving voltage end, for when described the first driving voltage end (DRB1) turn-offs, the charging circuit to described the second driving voltage end (DRB2) charging.
2. elimination active clamp topology normal shock shutdown oscillating circuit according to claim 1, is characterized in that, described control circuit comprises:
One diode (VD16), the first switching tube (VT8), a resistance-capacitance circuit, divider resistance (R49) and divider resistance (R51), wherein, described the first driving voltage end (DRB1) connects described diode (VD16) and is connected with the grid of described the first switching tube (VT8);
The grid of described the first switching tube (VT8) is also connected with one end of described resistance-capacitance circuit, and the other end of described resistance-capacitance circuit is connected and ground connection with the source electrode of described the first switching tube (VT8);
The drain electrode of described the first switching tube (VT8) is connected with the mid point of divider resistance (R49) and divider resistance (R51), another termination accessory power supply (VCC) of described divider resistance (R49), the other end ground connection of described divider resistance (R51).
3. elimination active clamp topology normal shock shutdown oscillating circuit according to claim 2, is characterized in that, described resistance-capacitance circuit comprises resistance (R48) and the electric capacity (C160) being connected in parallel.
4. elimination active clamp topology normal shock shutdown oscillating circuit according to claim 2, is characterized in that, described charging circuit comprises:
Second switch pipe (VT30), a resistance (R58), an electric capacity (C161), one parallel combination and the 3rd switching tube (VT14), wherein, the grid of described second switch pipe (VT30) connects the drain electrode of described the first switching tube (VT8), the source ground of described second switch pipe (VT30);
The drain electrode of described second switch pipe (VT30) is connected with accessory power supply (VCC) by described resistance (R58) on the one hand, by described electric capacity (C161), is connected with one end of described parallel combination on the other hand, and the other end ground connection of described parallel combination;
The drain electrode of described second switch pipe (VT30) is also connected with the grid of described the 3rd switching tube (VT14) by described electric capacity (C161), the source ground of described the 3rd switching tube (VT14), and the drain electrode of described the 3rd switching tube (VT14) connects described the second driving voltage end (DRB2).
5. elimination active clamp topology normal shock shutdown oscillating circuit according to claim 4, is characterized in that, described parallel combination is diode (VD30) and the resistance (R56) being connected in parallel, and the minus earth of described diode (VD30).
6. elimination active clamp topology normal shock shutdown oscillating circuit according to claim 4, is characterized in that, described the first switching tube (VT8), described second switch pipe (VT30) and described the 3rd switching tube (VT14) are metal-oxide-semiconductor or triode.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320848832.XU CN203722496U (en) | 2013-12-20 | 2013-12-20 | Circuit for eliminating active clamp topological forward shutdown oscillation |
| PCT/CN2014/079185 WO2014187390A1 (en) | 2013-12-20 | 2014-06-04 | Circuit for eliminating active clamp topology forward shutoff oscillation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320848832.XU CN203722496U (en) | 2013-12-20 | 2013-12-20 | Circuit for eliminating active clamp topological forward shutdown oscillation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203722496U true CN203722496U (en) | 2014-07-16 |
Family
ID=51161619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320848832.XU Expired - Lifetime CN203722496U (en) | 2013-12-20 | 2013-12-20 | Circuit for eliminating active clamp topological forward shutdown oscillation |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN203722496U (en) |
| WO (1) | WO2014187390A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490548A (en) * | 2014-09-15 | 2016-04-13 | Tdk株式会社 | Switching power device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI707528B (en) * | 2019-06-17 | 2020-10-11 | 瑞昱半導體股份有限公司 | Switch control circuit |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6614288B1 (en) * | 1998-05-20 | 2003-09-02 | Astec International Limited | Adaptive drive circuit for zero-voltage and low-voltage switches |
| US7012817B2 (en) * | 2004-02-10 | 2006-03-14 | Bel-Fuse, Inc. | Converter with integrated active clamp circuit and bias circuit |
| CN100356675C (en) * | 2005-07-13 | 2007-12-19 | 艾默生网络能源有限公司 | Circuit for preventing restart after active hoop DC/DC inverter off |
| US20090129127A1 (en) * | 2007-11-19 | 2009-05-21 | Lei Shi | Methods and devices for inhibiting negative output current during start-up of a switch mode power supply |
| CN201754562U (en) * | 2010-06-18 | 2011-03-02 | 瑞谷科技(深圳)有限公司 | Active clamp delay shutdown circuit |
| CN101917121A (en) * | 2010-07-15 | 2010-12-15 | 电子科技大学 | Active clamp synchronous rectification forward converter |
| CN103219876B (en) * | 2012-01-19 | 2016-08-24 | 南京中兴新软件有限责任公司 | A kind of shutdown stress circuit reducing active clamp and forward converter |
| CN203278620U (en) * | 2013-05-10 | 2013-11-06 | 雅达电子国际有限公司 | Isolation drive circuit with clamping function |
-
2013
- 2013-12-20 CN CN201320848832.XU patent/CN203722496U/en not_active Expired - Lifetime
-
2014
- 2014-06-04 WO PCT/CN2014/079185 patent/WO2014187390A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490548A (en) * | 2014-09-15 | 2016-04-13 | Tdk株式会社 | Switching power device |
| CN105490548B (en) * | 2014-09-15 | 2018-07-03 | Tdk株式会社 | Switching power unit |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014187390A1 (en) | 2014-11-27 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140716 |